[PATCH v4 3/5] dt-bindings: clock: cix,sky1-audss-clock: add audss clock controller

[joakim.zhang at cixtech.com]

From: Joakim Zhang <joakim.zhang at cixtech.com>

The AUDSS CRU contains an internal clock tree of muxes, dividers and
gates for DSP, I2S, HDA, DMAC and related blocks. The clock provider is
a child node of the cix,sky1-audss-system-control syscon and accesses
registers through the parent MMIO region.

Signed-off-by: Joakim Zhang <joakim.zhang at cixtech.com>
---
 .../bindings/clock/cix,sky1-audss-clock.yaml  | 72 +++++++++++++++++++
 .../dt-bindings/clock/cix,sky1-audss-clock.h  | 60 ++++++++++++++++
 2 files changed, 132 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/cix,sky1-audss-clock.yaml
 create mode 100644 include/dt-bindings/clock/cix,sky1-audss-clock.h

diff --git a/Documentation/devicetree/bindings/clock/cix,sky1-audss-clock.yaml b/Documentation/devicetree/bindings/clock/cix,sky1-audss-clock.yaml
new file mode 100644
index 000000000000..ea813c5a2307
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/cix,sky1-audss-clock.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/cix,sky1-audss-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cix Sky1 audio subsystem clock controller
+
+maintainers:
+  - Joakim Zhang <joakim.zhang at cixtech.com>
+
+description: |
+  Clock provider for the Cix Sky1 audio subsystem (AUDSS).
+
+  This node is a child of a cix,sky1-audss-system-control syscon node
+  (see cix,sky1-system-control.yaml). It does not have a reg property; clock
+  mux, divider and gate fields are accessed through the parent register block.
+
+  Software reset lines for AUDSS blocks are exposed on the parent syscon via
+  #reset-cells (provider). Reset indices are defined in
+  include/dt-bindings/reset/cix,sky1-audss-system-control.h.
+
+  Four SoC-level reference clocks listed in clocks/clock-names feed the AUDSS
+  clock tree. The provider exposes the internal AUDSS clocks to other devices
+  via #clock-cells; indices are defined in cix,sky1-audss-clock.h.
+
+  The parent cix,sky1-audss-system-control node describes the SoC syscon
+  NoC (or bus) reset via resets and the audio subsystem power domain via
+  power-domains.
+
+properties:
+  compatible:
+    const: cix,sky1-audss-clock
+
+  '#clock-cells':
+    const: 1
+    description:
+      Clock indices are defined in include/dt-bindings/clock/cix,sky1-audss-clock.h.
+
+  clocks:
+    items:
+      - description: I2S parent clock for sampling rates multiple of 8kHz.
+      - description: I2S parent clock for sampling rates multiple of 11.025kHz.
+      - description: clock feeding most devices in audss (NOC, DSP, SRAM, HDA, DMAC, I2S, and Mailbox).
+      - description: clock feeding for HDA, Timer and Watchdog, which is a delicated 48MHz clock.
+
+  clock-names:
+    items:
+      - const: x8k
+      - const: x11k
+      - const: sys
+      - const: 48m
+
+required:
+  - compatible
+  - '#clock-cells'
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/cix,sky1.h>
+
+    clock-controller {
+        compatible = "cix,sky1-audss-clock";
+        #clock-cells = <1>;
+        clocks = <&scmi_clk CLK_TREE_AUDIO_CLK0>, <&scmi_clk CLK_TREE_AUDIO_CLK2>,
+                 <&scmi_clk CLK_TREE_AUDIO_CLK4>, <&scmi_clk CLK_TREE_AUDIO_CLK5>;
+        clock-names = "x8k", "x11k", "sys", "48m";
+    };
diff --git a/include/dt-bindings/clock/cix,sky1-audss-clock.h b/include/dt-bindings/clock/cix,sky1-audss-clock.h
new file mode 100644
index 000000000000..7e9bd3e6c7a1
--- /dev/null
+++ b/include/dt-bindings/clock/cix,sky1-audss-clock.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright 2026 Cix Technology Group Co., Ltd.
+ */
+
+#ifndef _DT_BINDINGS_CLK_CIX_SKY1_AUDSS_CLOCK_H
+#define _DT_BINDINGS_CLK_CIX_SKY1_AUDSS_CLOCK_H
+
+#define CLK_AUD_CLK4_DIV2	0
+#define CLK_AUD_CLK4_DIV4	1
+#define CLK_AUD_CLK5_DIV2	2
+
+#define CLK_DSP_CLK		3
+#define CLK_DSP_BCLK		4
+#define CLK_DSP_PBCLK		5
+
+#define CLK_SRAM_AXI		6
+
+#define CLK_HDA_SYS		7
+#define CLK_HDA_HDA		8
+
+#define CLK_DMAC_AXI		9
+
+#define CLK_WDG_APB		10
+#define CLK_WDG_WDG		11
+
+#define CLK_TIMER_APB		12
+#define CLK_TIMER_TIMER		13
+
+#define CLK_MB_0_APB		14	/* MB0: ap->dsp */
+#define CLK_MB_1_APB		15	/* MB1: dsp->ap */
+
+#define CLK_I2S0_APB		16
+#define CLK_I2S1_APB		17
+#define CLK_I2S2_APB		18
+#define CLK_I2S3_APB		19
+#define CLK_I2S4_APB		20
+#define CLK_I2S5_APB		21
+#define CLK_I2S6_APB		22
+#define CLK_I2S7_APB		23
+#define CLK_I2S8_APB		24
+#define CLK_I2S9_APB		25
+#define CLK_I2S0		26
+#define CLK_I2S1		27
+#define CLK_I2S2		28
+#define CLK_I2S3		29
+#define CLK_I2S4		30
+#define CLK_I2S5		31
+#define CLK_I2S6		32
+#define CLK_I2S7		33
+#define CLK_I2S8		34
+#define CLK_I2S9		35
+
+#define CLK_MCLK0		36
+#define CLK_MCLK1		37
+#define CLK_MCLK2		38
+#define CLK_MCLK3		39
+#define CLK_MCLK4		40
+
+#endif
-- 
2.50.1